Former All-Pro guard Evan Mathis is launching a new business, and the prizes that he’ll be giving away to promote CardSeer include his Super Bowl 50 family ring.

“For almost three years we’ve been developing it,” Mathis said about CardSeer during an appearance on the “Uncovering the Birds” podcast with Jeff McLane earlier this year, “and it’s going to be a super, super advanced technological marketplace. To simplify it, let’s just start with buying a (trading) card. If you want to buy a card, where’re you going to do it? You can go to eBay, and they’re only one site. There’s over 40 more that you can go buy and sell on. What we are doing, we are taking all those listings from everywhere … bringing all those listings into one place.”

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Mathis has announced that as part of CardSeer’s launch promotion at the National Sports Collectors Convention on July 26-30 in Rosemont, Illinois, his new company will be giving away more than $500,000 in prizes. Listed along with card holders, sleeves and a Bryce Harper rookie card as prizes is Mathis’ family ring from Super Bowl 50.

The former Alabama standout was Denver’s left guard in the Broncos’ 24-10 victory over the Carolina Panthers in the NFL championship game for the 2015 season.

The family ring is not the ring that Mathis received from the team. Family rings are slightly scaled-down versions of the Super Bowl ring.

Mathis said he had high hopes for CardSeer.

“If you give people a reason to go no other place to start their trading-card buying, then you start to control the traffic for what’s a $20- to $30-billion industry,” Mathis said, “and if you do the math on what that means in terms of gross revenue and net revenue, it’s absolutely massive. My goal is to be a multi-billionaire here soon and doing it with a really fun project.”

Mathis has made a splash in sports cards previously.

In 2018, Mathis sold a Mickey Mantle card from the 1952 Topps set for $2.88 million, the second-highest price paid for a baseball card at the time.

In 2019, he sold a Tom Brady card from the 2000 Playoff Contenders Championship Ticket collection for $400,100, which was the highest auction price that has been paid for a football card at the time.

An All-State football player in 1999, as well as a state wrestling champion and track and field standout, for Homewood High School, Mathis was a four-year starter in Alabama’s offensive line. He joined the NFL as a third-round draft choice of the Carolina Panthers in 2005.

Mathis played for the Panthers, Cincinnati Bengals and Miami Dolphins before being recognized as one of the NFL’s top linemen while with the Philadelphia Eagles. Mathis was selected for the Pro Bowl in 2013 and 2014, and he earned All-Pro recognition in 2013.

After his championship season with the Broncos, Mathis closed his NFL career with the Arizona Cardinals in 2016, when injuries limited him to four games.

“I was nothing but a product of my environment,” Mathis said about his football career. “Born in Birmingham, Alabama. My mom’s brother (Bob Baumhower) was in the NFL for 10 years. He was an All-Pro at Alabama. I think he retired in ‘86 or ‘87, and I was born in ‘81, so kind of a young kid but getting exposed to that and, like, the amount of pride that brought to the family and that kind of success. And then I’m in Alabama. Football is everything down there. It was like chasing that kind of success, it was all I ever knew. It was really the only thing I knew.”

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Mark Inabinett is a sports reporter for Alabama Media Group. Follow him on Twitter at @AMarkG1.